Does anyone have any solutions for parent w/ dementia who puts foreign objects in the toilet causing backups?

We had that issue when dad was first moved into a memory cottage, and we were financially responsible for the damage. He was stuffing stuff down his sink and flooding his room. We bought a motion activated faucet and hasn’t been an issue since.

Supervised bathroom trips will be required because you cannot keep calling the plumber.

Offer her a commode instead. You can purchase one at a medical supply company or find a good one at thrift stores. You could even decorate the lid and let her know it's a gift of a comfy new toilet. Offer to help her wash her hands too. ( If you place garbage sacks or recycled plastic grocery bags inside the commode it's easier clean up. No more plumbing bill. )

We had to switch to commode only after 3 expensive plumber visits. No problems since.

If your loved one is super routined with toileting and let’s say they are only placing items in the morning or evening and not all day, consider safety proofing home along with hiring an in home caregiver. They can be hired through a nonmedical home care agency that’s specializes in dementia and offers care from 1-24/7. Make sure you talk to their physician as well so they know all the aspects you are dealing with. Good luck.

My Dad did! Rags. So many rags. So many plumbing bills. It took about a year to realize what was happening. Other issues along with this activity caused us to place in a nursing home. I have no solution for you, I’m sorry.